1. Environmental Science Do Now 9-19-17
Use the image of an ecosystem, at your table, to classify things that belong to the geosphere, hydrosphere, atmosphere and biosphere. Then, explain how the things in each sphere interact with each other.
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2. Environmental Science Do Now Answer Key 9-19-17
Geosphere: soil, hills
Atmosphere: air
Biosphere: grasses, deer, hawk, frogs, fish, turtles, cattails, Lily pad, trees, flowers, insects and ferns
Hydrosphere: pond

3. Engage
What is a cycle?
What do you think it means to describe the Earth as a big recycling plant?
How do elements necessary for life on Earth move from living to non-living and back to living things again?

4. Explore
Students will watch the “Carbon and Nitrogen Cycles” video and will write down one unique characteristic for each cycle.
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 Students will watch the “Phosphorus Cycle” and will write down one unique characteristic for this cycle.
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5. Explain
Biogeochemical Cycles: Water, Carbon, Nitrogen and Phosphorus Cycles PPT (students will copy the notes)

6. Extend
Students will complete the POGIL on Nutrient Cycles

7. Evaluate Exit Ticket Questions:
Explain how water is cycled throughout the Earth.
Explain how carbon is cycled throughout the Earth.
Explain how nitrogen is cycled throughout the Earth.
Explain how phosphorus is cycled throughout the Earth.

8. Biogeochemical Cycles
Environmental Science
Unit 1: Introduction to Environmental Science
September 19, 2017

9. Biogeochemical Cycles
describe the flow of essential elements from the environment through living organisms and back into the environment.

10. Hydrological Cycle

11. Hydrological Cycle (water cycle)
1. Reservoir – oceans, air (as water vapor), groundwater, lakes and glaciers; evaporation, wind and precipitation (rain) move water from oceans to land
2. Assimilation – plants absorb water from the ground, animals drink water or eat other organisms which are composed mostly of water
3. Release – plants transpire, animals breathe and expel liquid wastes

12. Hydrological Cycle
1. Reservoir – oceans, air (as water vapor), groundwater, lakes and glaciers; evaporation, wind and precipitation (rain) move water from oceans to land.
2. Assimilation – plants absorb water from the ground, animals drink water or eat other organisms which are composed mostly of water.
3. Release – plants transpire, animals breathe and expel liquid wastes.

13. Carbon Cycle

14. Carbon Cycle (carbon is required for building organic compounds)
1. Reservoir – atmosphere (as CO2), fossil fuels (oil, coal), durable organic materials (for example: cellulose).
2. Assimilation – plants use CO2 in photosynthesis; animals consume plants.
3. Release – plants and animals release CO2 through respiration and decomposition; CO2 is released as wood and fossil fuels are burned.

16. Carbon Cycle
1. Reservoir – atmosphere (as CO2), fossil fuels (oil, coal), durable organic materials (for example: cellulose).
2. Assimilation – plants use CO2 in photosynthesis; animals consume plants.
3. Release – plants and animals release CO2 through respiration and decomposition; CO2 is released as wood and fossil fuels are burned.

17. Nitrogen Cycle

18. Nitrogen Cycle (Nitrogen is required for the manufacture of amino acids and nucleic acids)
1. Reservoir – atmosphere (as N2); soil (as NH4+ or ammonium, NH3 or ammonia, N02- or nitrite, N03- or nitrate

19. Nitrogen Cycle
2. Assimilation – plants absorb nitrogen as either NH4+ or as N03-, animals obtain nitrogen by eating plants and other animals. The stages in the assimilation of nitrogen are as follows:
Nitrogen Fixation: N2 to NH4+ by nitrogen-fixing bacteria (prokaryotes in the soil and root nodules), N2 to N03- by lightning and UV radiation.
Nitrification: NH4+ to N02- and N02- to N03- by various nitrifying bacteria.

20. Nitrogen Cycle
3. Release – Denitrifying bacteria convert N03- back to N2 (denitrification); detrivorous bacteria convert organic compounds back to NH4+ (ammonification); animals excrete NH4+ (or NH3) urea, or uric acid.

21. Nitrogen Cycle
1. Reservoir – atmosphere (as N2); soil (as NH4+ or ammonium, NH3 or ammonia, N02- or nitrite, N03- or nitrate
2. Assimilation – plants absorb nitrogen as either NH4+ or as N03-, animals obtain nitrogen by eating plants and other animals.
3. Release – Denitrifying bacteria convert N03- back to N2; detrivorous bacteria convert organic compounds back to NH4+ ; animals excrete NH4+, urea, or uric acid.

22. Phosphorus Cycle

23. Phosphorus Cycle (Phosphorus is required for the manufacture of ATP and all nucleic acids)
1. Reservoir – erosion transfers phosphorus to water and soil; sediments and rocks that accumulate on ocean floors return to the surface as a result of uplifting by geological processes
2. Assimilation – plants absorb inorganic PO43- (phosphate) from soils; animals obtain organic phosphorus when they plants and other animals
3. Release – plants and animals release phosphorus when they decompose; animals excrete phosphorus in their waste products

24. Phosphorus Cycle
Reservoir – erosion transfers phosphorus to water and soil; sediments and rocks that accumulate on ocean floors return to the surface as a result of uplifting by geological processes
Assimilation – plants absorb inorganic PO43- (phosphate) from soils; animals obtain organic phosphorus when they plants and other animals
Release – plants and animals release phosphorus when they decompose; animals excrete phosphorus in their waste products

25. Biogeochemical cycles of other minerals, such as calcium and magnesium, are similar to the phosphorus cycle.